29 Jun
2023
29 Jun
'23
9:03 p.m.
Rich Salz wrote in
<CAFH29toi4aFfGY7g+SndAPz6ndjk8j+LKZOGfnd2GQGnrNXKhw(a)mail.gmail.com>:
|A perl script to inuit likely roff options as definitely a neat Unix hack.
The "problem" is that the "shebang" line used for UNIX man'uals
on
at least a few ("newer" <> post Y2K) systems has never been
extended in plain *roff terms, for general macro things. Ie that
For example, newer man(1)s read the first line of the manual and
check for a syntax <^'\" >followed by concat of [egprtv]+ (and in
fact *join in* $MANROFFSEQ environment [egprtv]+)
while getopts 'egprtv' preproc_arg; do
case "${preproc_arg}" in
e) pipeline="$pipeline | $EQN" ;;
g) GRAP ;; # Ignore for compatibility.
p) pipeline="$pipeline | $PIC" ;;
r) pipeline="$pipeline | $REFER" ;;
t) pipeline="$pipeline | $TBL" ;;
v) pipeline="$pipeline | $VGRIND" ;;
*) usage ;;
esac
Of course, most roff's do not have that "super process" that groff
actually is, for one, so you have to formulate pipelines anyway.
And then roff is dead for the young. Generally speaking.
It is only a pity in my opinion because the most widely used
implementation (GNU roff) actually does "magic" already and
anyway, namely in its preconv(1), which does
preconv tries to find the input encoding with the following algorithm.
...
2. Otherwise, check whether the input starts with a Byte Order Mark
(BOM, see below). If found, use it.
3. Otherwise, check whether there is a known coding tag (see below)
in either the first or second input line. If found, use it.
...
5. If everything fails[.]
And 3. is then
[.]supports the coding tag convention (with some restrictions)
as used by GNU Emacs and XEmacs[.]
...
.\" -*- mode: troff; coding: latin-2 -*-
But possibly the future brings not only integrative and truthful
western white men, but also a roff which "can". The former
i doubt, the latter i can still hope for.
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)